/* Basic CSS Reset */
html {
  box-sizing: border-box;
  font-size: 16px;
}

*, *:before, *:after {
  box-sizing: inherit;
}

body, h1, h2, h3, h4, h5, h6, p, ol, ul {
  font-family: 'Roboto', sans-serif;
  margin: 0;
  padding: 0;
  font-weight: normal;
}

ol, ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
}

/* Demo styles */
nav {
  position: fixed;
  top: 32px;
  left: 0;
  right: 0;
}
nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
}
nav ul li:not(:last-child) {
  margin-right: 40px;
}
nav ul li a {
  display: block;
  font-size: 18px;
  letter-spacing: .025em;
  text-decoration: none;
  color: var(--c, #000);
  transition: color .3s ease;
}
nav ul li a:hover {
  --c: #fff;
}

section {
  align-items: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 100vh;
}
section h2 {
  color: #000;
  font-size: 60px;
  font-weight: 500;
  margin-bottom: 9px;
}
section p {
  background-color: #333;
  border-radius: 9px;
  color: #fff;
  padding: 9px;
}
section p a {
  color: #bbb;
  text-decoration: none;
}

#section-1 {
  background: #ccc;
}

#section-3 {
  background: #bbb;
}

#section-2 {
  background: #aaa;
}
#section-4 {
  background-image: url('http://img3.imgtn.bdimg.com/it/u=1960330002,2943700579&fm=26&gp=0.jpg');
  background-repeat: no-repeat;
  background-size: 100% 100%;
}
#section-5 {
  background-image: url('https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=225193914,751284870&fm=26&gp=0.jpg');
  background-repeat: no-repeat;
  background-size: 100% 100%;
}
#section-6 {
  background-image: url('https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3019995954,636527762&fm=26&gp=0.jpg');
  background-repeat: no-repeat;
  background-size: 100% 100%;
}